Postsun splotchiness, despite the sunscreen

The mistake: Applying SPF too quickly when you're already out in the sun.

The quick fix: Swear off the speedy spray n' play approach. Give yourself a good chunk of time to make sure you get every single square inch and apply 30 minutes before going out, says Vermén M. Verallo-Rowell, M.D., author of Skin in the Tropics: "Sunscreen needs time to soak in."